DTC Detection Logic

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If DTC B2603 is displayed with DTC B2601, first perform the trouble diagnosis for DTC B2601. Refer to DTC Logic .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible causes

B2603

SHIFT POSI STATUS

BCM detects the following status when ignition switch is in the ON position.

P (Park) position signal from TCM: approx. 0 V
CVT shift selector (park position switch) signal: approx. 0 V

Harness or connector
[CVT shift selector (park position switch) circuit is open or shorted.]
Harness or connectors
(TCM circuit is open or shorted.)
CVT shift selector (park position switch)
CVT assembly (TCM)
BCM